Manufacture of lenticular stencil film



July 26, 1938. s. HEYMER MANUFACTURE OF LENTICULAR STENCIL FILM Filed June 9, 1936 Inventor Aflor d h meme my 26, 1938 2,12%,162

UNITED STATES PATENT OFFICE 2,125,! MANUFACTURE OFFIENTICULAR STENCIL Gcrd Heymcr, Wolfen Kreis Bitterleld, Germany,

minor to Agfa Ansco Corporation, Binghamton, N. Y., a corporation of NcwYoi-k Application June 9, 1938, Serial No. 84,326 In Germany April 30, 1932 2 Claims. (01. tic-19.5)

My present invention relates to the manufacof the co-ordinated lenticular element are called .ture oilenticular stencil film. It isacontinuation filter middle lines or green middle lines as the in part of my application Ser. No. 667,925 filed green filter strip is usually the central filter strip. April 25, 1933 which has matured into Patent If the ai'ore-describedfilmis printed on another 5 No. 2,066,727, dated Jan. 5, 1937. lenticular film with its lenticular elements fac- -5 One of its objects is to provide a process for lng those of the-printing film as it is shown in the manufacture of lenticular stencil film. Fig. 2, the above described displacements of the Another object is the lenticular stencil film. partial color strips with relation to the axis of the Further objects will be seen from the detailed lenticular elements are reversed, that is to say the specification following hereafter. partial color strips on the margin of the films 10 Reference is made to the accompanying drawwhich are displaced outwardly on the original ing in which: are displaced inwardly on the printing film. If,

Fig. 1 shows the relations between a lenticular for instance, the red strip of the multi-color filter film and the co-ordinated multi color filter in is photographed on a lenticular film and the origitaking, and nal thus taken is printed on a second, light- 15 Fig. 2 shows the manner in which the partial sensitive lenticular film in contact with the lenticcolor picture strips behind the lenticular elements ulated sides of the films facing each other it will are displaced when printing the lenticular film be found that the print has transparent strips in shown in Fig. l in contact on a light sensitive the silver layer at places corresponding with those lenticular film with the lenticular elements facing of the original, however, these strips are displaced 20 each other, and on the print with relation to the axis of the Fig. 3 shows a lenticular stencil film in accordlenticular elements by the same amount inwardly ance with the invention. as they are displaced outwardly on the original.

In my above mentioned application I have de- If instead of the afore-said original there is scribed a process for the production of partial placed another original containing in its emulsion 25 color pictures by printing from a lenticular film layer another picture on the afore-said print and without the application of a diaphragm. This is illuminating the film from the layer-side, this realized by arranging in contact with the lenticuoriginal is projected on the print made from the lar film from which the partial color pictures original taken by illumination with the red filter are to be printed a second lenticular film acting strip. However, as this print is only transparent 30 in the manner of a stencil in that it admits only at those places at which the red filter strip had one partial color picture to act on the printing been copied only those rays can pass unhindered material. Printing with a stencil film is in manthrough the film which correspond with the red nei; related with the printing of lenticular film partial color picture in taking. Therefore, it is in contact, because the original and the stencil possible to separate by means of a stencil film the 35 film are also arranged with their lenticulated side trace of the rays of a partial color picture of a in contact and the original is illuminated from lenticular film from the remaining partial color the rear side. pictures and to print this partial color picture on The principle which leads to the production of a another material. If the trace of the rays is re- 40 stencil film will more clearly result from the folversed and illumination is made first through the 40 lowing explanations. In taking a lenticular film stencil film and then through the lenticular elethe lenticular elements project real images RGB' ments of a light sensitive lenticular film only (see Fig. 1) on the emulsion layer of the photosuch rays are recorded on the second film as graphic film. When comparing the position of correspond with those passing through the red .4; the various small central pictures G it will be filter strip in taking so that it is possible to print found that these pictures corresponding with the partial color pictures taken on smooth film on a middle or green filter strip of the multi-color lenticular film by contact printing. filter lie in the middle of the space of the emul- From this application of a stencil film clearly sion layer behind one lenticular element but are follows its production attention being necessary displaced towards the margin on the space bethat the inclination of the rays from the lenticu- 50 bind the marginal lenticular elements. By the lar elements to the middle of the green filter position of the small pictures on the space bestrip be correct. hind the lenticular elements the position of the As already described for the production of a multi-color filter is determined. The lines from stencil film there is first made a so-called interthe central partial color picture striptothe center mediate film, that is to say a film which under 55 the filter condition of the exposure is taken through a single filter strip as abo ie described through the red filter strip. In exactly the same manner there is produced an intermediate film by illuminating a light sensitive lenticular film through the green filter strip and a further intermediate film by illuminating a lenticular film through the blue filter strip. All these films have the following characteristic: Behind each lenticular element there are positioned transparent strips and opaque strips which latter are formed by developed silver. Instead of the opaque strips there may also be present colored strips. If light is projected through the middle of the transparent strips in direction towards the middle of the co-ordinated lenticular element all these rays out each other in the middle of the corresponding color strip of the exposure filter.

Qbviously it is not necessary to use in the manufacture of the intermediate film the color strip of an exposure filter but it is also possible to use instead an illuminated diaphragm the aperture of which corresponds as to size and position with relation to the film with these conditions of the exposure filter strip replaced by the diaphragm aperture. If the stencil film is intended for use in printing partial color pictures on a lenticular film the dimensions of the corresp-ondlng values of the projection filter are determinative. The stencil film is produced from the intermediate film byilluminating the intermediate film placed in contact with a light sensitive lenticular film with the lenticulated sides facing each other by means of a dlflused source of light for instance an illuminated groune glass screen.

A stencil film in accordance with the invention is shown in Fig. 3. It consists of the support T, having a system of lenticular embossings L, and the light-sensitive layer B which is blackened except for the transparent areas J. These areas occupy determined positions to the lenticular elements L that in each particular case is characteristic for the direction of the light which emanates from the lenses L, if the stencil film" is illuminated through its layer side.

What I claim is:

1. A lenticular film comprising an emulsion layer and in this emulsion layer a silver picture composed of alternating transparent and blackened stripes of which one transparent stripe and one blackened stripe are cc-ordinate to one lentic- =slar element, the central line 01' the transparent stripes positioned near the margin of the film being displaced towards the margin of the film with respect to the central line of the transparent areas positioned in the middle 01 the film.

2. A lenticularfilm comprising an emulsion layer and in this emulsion layer a silver picture composed of alternating transparent and blackened stripes of which one transparent stripe and one blackened stripe are co-ordinate to one lenticular element, the central line of the transparent stripes positioned near the margin of the film being displaced towards the middle of the film with respect'to the central line of the transparent areas positioned in the middle of the film.

GERD HEYMER. 

